EXHIBIT 12.1

XTO ENERGY INC.

COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES



|                                                                    |  |                        |       |      |   |       |  |      |       |      |   |     |  |   |    
|------------------------------------------------------------------- |  | ---------------------- | ----- | ---- | - | ----- |  | ---- | ----- | ---- | - | --- |  | - | ---
|(in millions, except ratios)                                        |  | Year Ended December 31
|                                                                    |  | 2007                   |       | 2006 |   | 2005  |  | 2004 |       | 2003
|Income before income tax and cumulative effect of accounting change |  | $                      | 2,642 |      | $ | 2,961 |  | $    | 1,810 |      | $ | 826 |  | $ | 444
|Interest expense                                                    |  |                        | 267   |      |   | 182   |  |      | 154   |      |   | 94  |  |   | 64 
|Interest portion of rentals                                         |  |                        | 5     |      |   | 7     |  |      | 8     |      |   | 7   |  |   | 9  
|                                                                    |  |                        |       |      |   |       |  |      |       |      |   |     |  |   |    
|Earnings before provision for taxes and fixed charges               |  | $                      | 2,914 |      | $ | 3,150 |  | $    | 1,972 |      | $ | 927 |  | $ | 517
|                                                                    |  |                        |       |      |   |       |  |      |       |      |   |     |  |   |    
|                                                                    |  |                        |       |      |  
|Interest expense                                                    |  | $                      | 267   |      | $ | 182   |  | $    | 154   |      | $ | 94  |  | $ | 64 
|Capitalized interest                                                |  |                        | 30    |      |   | 18    |  |      | 6     |      |   | 3   |  |   | 2  
|Interest portion of rentals                                         |  |                        | 5     |      |   | 7     |  |      | 8     |      |   | 7   |  |   | 9  
|                                                                    |  |                        |       |      |   |       |  |      |       |      |   |     |  |   |    
|                                                                    |  |                        |       |      |  
|Total Fixed Charges                                                 |  | $                      | 302   |      | $ | 207   |  | $    | 168   |      | $ | 104 |  | $ | 75 
|                                                                    |  |                        |       |      |   |       |  |      |       |      |   |     |  |   |    
|                                                                    |  |                        |       |      |  
|Ratio of Earnings to Fixed Charges                                  |  |                        | 9.6   |      |   | 15.2  |  |      | 11.7  |      |   | 8.9 |  |   | 6.9